Factorial

gistfile1.txt

#factorial

def factorial(x)
  if x <= 1
    return 1
  else
    x * factorial(x - 1)
  end 
end

puts "give me the number"
x = gets

puts "the factorial of " + x + " is : " + factorial

(x.to_i).to_s

.------------------

result in console

give me the number
100
the factorial of 100
 is : 93326215443944152681699238856266700490715968264381621468592963895217599993
22991560894146397615651828625369792082722375825118521091686400000000000000000000
0000